When I am using PIP to watch two channels at once side by side I can use the swap button to switch tuners without any problems but if I use the PIP swap button to switch tuners while not side by side (full screen) sometimes the 622 will freeze. I get no picture but I do get sound from the tuner I tried to switch to. None of the buttons on the remote will work. I have to reboot the 622 from the front panel button to get it working again. Would this be a software problem? I am currently on 6.14.